Jim Hone's Analysis of Vertebrate Pest Control PDF
By Jim Hone
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3) As the number of positives (d) increases then the sample size decreases, as the population size (JV) increases the sample size increases and as the reliability required (c) increases then the sample size also increases. Often when studying wildlife populations the actual population size is unknown. The equation could be used as a guide by inserting a best guess for N in the equation. The estimated sample size is not very sensitive to differing values of N when N is large. 99, then the sample size for a population of 200 is 136, when N = 400 the sample size is 174, and for N = 1000 the sample size is 204.
The rate was defined as the logarithm of the ratio of successive measures of damage, that is, log(Dt/Dt_ J , where Dt_ x is the initial damage and Dt is the damage at the next time of measurement one month later. Lefebvre et al. (1989) also applied analysis of variance to examine differences between times in rodent damage to sugarcane in southern Florida. The effects of farms, times and position in a crop on mouse damage to soybean crops were analysed by split-plot analysis of variance by Singleton et al.
The effect of black-tailed prairie dogs (Cynomys ludovicianus) on pasture biomass in a part of South Dakota was estimated by comparison of plots with and without the prairie dogs (Collins, Workman & Uresk, 1984). As the study aimed to estimate the biomass of extra forage available to cattle, then ideally as noted by the authors, both sets of plots should have had cattle grazing the pastures. Buckle et al. (1984) estimated damage to rice crops by rice field rat (Rattus argentiventer) in Malaysia by comparing crops with and without rodent control.